How to enable single click?

I have Ubuntu 13.10 installed with the default window manager and DE.

I am trying to enable single click so I can open files and folders with only one click. I tried googling and all results said to open Files, then go to Preferences from the top bar, but my top bar has no options.

Here is a picture of my desktop:

picture of desktop


Solution 1:

For 13.10 Go to files then click on Preferences

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Then

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For 14.04 Go to files, then click on Edit --> Preferences

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Click on the Behavior Tab, and then click on Single Click to open items. See image below

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Try sudo apt-get install --reinstall nautilus